Bump testng from 7.5 to 7.6.1

Bumps [testng](https://github.com/cbeust/testng) from 7.5 to 7.6.1.
- [Release notes](https://github.com/cbeust/testng/releases)
- [Changelog](https://github.com/cbeust/testng/blob/master/CHANGES.txt)
- [Commits](testng-team/testng@7.5...7.6.1)

---
updated-dependencies:
- dependency-name: org.testng:testng
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

build.gradle

@@ -15,7 +15,7 @@ plugins {
 ext {
     reactiveStreamsVersion = "1.0.4"
     junitVersion = "4.13.2"
-    testNgVersion = "7.5"
+    testNgVersion = "7.6.1"
     mockitoVersion = "4.6.1"
     jmhLibVersion = "1.21"
     guavaVersion = "31.1-jre"